2024/03/27 by In Woo Park, Park, In Woo, H. Sako +7 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2403.18288
openalex publication_date 2024/03/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Observing the mass shifts of chiral partners will provide invaluable insight into the role of chiral symmetry breaking in the generation of hadron masses. Because both the K^* and K1 mesons have vacuum widths smaller than 100 MeV, they are ideal candidates for realizing mass shift measurements. On the other hand, the different momentum dependence of the longitudinal and transverse modes smear the peak positions. In this work, we analyze the angular dependence of the two-body decays of both the K^* and K1. It is found that the longitudinal and transverse modes of the K^* can be isolated by observing the pseudoscalar decay in either the forward or perpendicular directions, respectively. For the K1 decaying into a vector meson and a pseudoscalar meson, one can accomplish the same goal by further observing the polarization of the vector meson through its angular dependence on the two pseudoscalar meson decay.